If you want to find the hardest game "Color Flood" this is it https://play.google.com/store/apps/details?id=com.phihupitu.colorflood.unlimited Color Flood is kind of addicted puzzle game. The block of ColorFlood is to flood all cells in field with one color by using as few turns as possible. Change the color of the square in the top-left corner to one of the adjacent colors, by tapping on one of the 6 colored squares at the bottom. Adjacent squares with the same color are flooded. Try to use as few turns as possible and finish as fast as possible! 25x 25 block (largesst board in color flood game)